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Hello,
I would recommend starting with a traceroute from your PC to the droplet:
traceroute your_droplets_ip_here
That way you should be able to figure out if your connections are getting to the droplet at all.
Also, could you share the following:
What is the firewall that you are using?
Can you share the firewall rules that you currently have?
What is the exact error that you get when you try to SSH to the droplet?
Are you trying to login with the root user and do you have your SSH key uploaded already?
What is the OS that you are using?
Regards, Bobby
thanks, I know the reason, because of the GFW blocked the ipaddress, btw, I am from China… Thansk for help.